Fujitsu R407C User Manual

PCB LED
1 to 6
LCD
LED display
Cause
Remote
controller
Indoor
unit
Outdoor
unit
Controlling
display
(Operation
display LED
flashing)
Controlling
display
(Defrosting
operation)
Normal
display
Defrosting operation in progress.
Error display
(Outdoor unit
error display)
Error display
(Compressor
error)
Error display
(Outdoor
unit error)
Compressor is faulty.
Voltage (AC380-415V) is applied
to secondary side of magnetic
relay, but compressor does not
operate.
When one or two of three com-
pressors damaged, recovery
operationwill start automatically.
Resistance of compressor at 25 C
Compressor is faulty.
Compressor lock
When the compressor does not
operate, measure the line-to-line
and line-to-ground resistance of
the compressor.
(When the compressor is locked,
the resistance will show a nomal
value.)
When this trouble occurs, the oil
in the compressor has deteriorat-
ed (with black color).
Compressor is faulty.
Compressor motor burned
When the compressor does not
operate, measure the line-to-line
and line-to-ground resistance of
the compressor.
(When the motor is burned, the
line-to-line resistance increases
(open circuit) and line-to-ground
resistance decreases.)
When this trouble occurs, the oil
may not deteriorate.
Therefore, operation can be
continued, the power line of
the demaged compressor
must be disconnected.
Error display
(Outdoor
unit error)
Error display
(Reverse
phase error)
Error display
(Outdoor
unit error)
Compressor is faulty.
The compressor operates, but
the high pressure does not rise.
Reverse phase
The compressor wiring is red-R,
white-S, and black-T.
Error display
(Communi-
cation
error)
Error display
(Communi-
cation
error)
Error display
(Communi-
cation
error)
Outdoor unit communication
PCB is faulty.
When power reset for the outdoor
or indoor unit is repeated,
a communication error is
generated.
If the display returns to normal by
reset during no communicating
period, the communication
PCB or communication line
may be abnormal.
No display
or error
display
(cannot be
specified)
Cannot be
specified.
No display
or error
display
(cannot be
specified)
Indoor unit control PCB is faulty. The symptom has many
branches, depending on the
error contents, and there is no
effective check method.
Cannot be
specified.
No display or
error display
(cannot be
specified)
Cannot be
specified.
Outdoor unit control PCB is faulty.
The symptom has many
branches, depending on the
error contents, and there is no
effective check method.
When the PCB or the connection
wiring is faulty, problem can
often be solved by replacing
the PCB.
Remarks
Check method
(Error state check method)
Operation display LED
flashes ( 3 seconds ON,
1 second OFF) and repeats.
Compressor motor burned
Compressor lock
Therefore, long-term operation
should avoid because it will
cause another compressor lock.
Symptom that
can occur other
than title
1
2
Outdoor unit heat exchanger
extremely cold. (- 5 C or less)
1
DEFROST message
appears on the display of
the remote controller.
2
Body
LED
05-42
Become normal after the power
is reset.
(line-to-line)
The fan of the
indoor unit
does not rotate.
Abnormal sound
is heard from
indoor unit.
When the PCB or the connection
wiring is faulty, problem can
often be solved by replacing
the PCB.
The fan of the
indoor unit
does not rotate.
Abnormal sound
is heard from
indoor unit.
Comp. 1 : 8.64 (+/- 7%).
Comp. 2 : 3.700 (+/- 7%).
Comp. 3 : 0.517 (+/- 7%).

Fujitsu R407C Specifications

General

Brand	Fujitsu
Model	R407C
Category	Air Conditioner
Language	English